I have a polygon and some measurements made inside that polygon and I would like to create isobands for the entirety of it. However, it seems interpolate only runs inside the bounding box that it creates automatically and it only encapsulates the points that I have provided with values. How could I expand it to the entire polygon?

This is the exact same issue in #2297. On that issue, the author has provided a working fiddle for his case https://jsfiddle.net/doug_b/xbd6Lf74/3/.

Turf.js version: 6.5.0